1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "buffered_output_stream.h"
18
19#include <string.h>
20
21namespace art {
22
23BufferedOutputStream::BufferedOutputStream(OutputStream* out)
24    : OutputStream(out->GetLocation()), out_(out), used_(0) {}
25
26bool BufferedOutputStream::WriteFully(const void* buffer, size_t byte_count) {
27  if (byte_count > kBufferSize) {
28    Flush();
29    return out_->WriteFully(buffer, byte_count);
30  }
31  if (used_ + byte_count > kBufferSize) {
32    bool success = Flush();
33    if (!success) {
34      return false;
35    }
36  }
37  const uint8_t* src = reinterpret_cast<const uint8_t*>(buffer);
38  memcpy(&buffer_[used_], src, byte_count);
39  used_ += byte_count;
40  return true;
41}
42
43bool BufferedOutputStream::Flush() {
44  bool success = true;
45  if (used_ > 0) {
46    success = out_->WriteFully(&buffer_[0], used_);
47    used_ = 0;
48  }
49  return success;
50}
51
52off_t BufferedOutputStream::Seek(off_t offset, Whence whence) {
53  if (!Flush()) {
54    return -1;
55  }
56  return out_->Seek(offset, whence);
57}
58
59}  // namespace art
60